This extension sould be able to load in one click all the other videos in the same folder that are of a similar name.

Example:

You are watching

Dexter.S04.e06.vost+x264.mkv

One click would make all other Dexter.S04.e07.vost+x264.mkv Dexter.S04.e08.vost+x264.mkv etc... load inside the playlist.